Flame retardant compositions

ABSTRACT

Polyol adjuvants are provided which have the property of imparting flame-retardant characteristics to polyurethane foams. The adjuvants are prepared by condensing at least one mole of 3halo-1,2-propanediol and at least one mole of 1,3-dihalo-2propanol with a tetrahalo bisphenol A or, alternatively, with the reaction product of at least one mole of a phenol, a chlorophenol and at least one mole of the same or another phenol with at least one mole of formaldehyde. The condensation products are subsequently reacted with the salt of a saturated or unsaturated partial ester of phosphoric acid and optionally brominated in the latter case. Flame-retardant polyurethane foams are disclosed containing the novel polyol adjuvants.

United States Patent Kuehn Oct. 24, 1972 [54] FLAME RETARDANT COMPOSITIONS [72] Inventor: Erich Kuehn, Wilmington, Del.

[73] Assignee: Atlas Chemical Industries, Inc.,

Wilmington, Del.

[22] Filed: Feb. 19, 1971 [21] App1.No.: 117,038

Related U.S. Application Data [62] Division of Ser. No. 728,913, May 14, 1968,

Pat. No. 3,644,599.

[52] U.S. Cl. ..260/6l3 R, 260/77.5 AR, 252/182,

260/953 [51] Int. Cl ..C07c 43/28 [58] Field of Search ..260/613 R [5 6] References Cited UNITED STATES PATENTS 2,571,217 10/1951 Davis et al. ..260/613 R 3,162,615 12/1964 Bremmer ..260/6l3 R X FOREIGN PATENTS OR APPLICATIONS 689,135 6/1964 Canada .613 R Primary Examiner-Bernard Helfin Attorney-Kenneth E. Mulford et al.

[57] ABSTRACT Polyol adjuvants are provided which have the property of imparting flame-retardant characteristics to polyurethane foams. The adjuvants are prepared by con densing at least one mole of 3-halo-1,2-propanediol and at least one mole of 1,3-dihaJo-2-propanol with a tetrahalo bisphenol A or, alternatively, with the reaction product of at least one mole of a phenol, a chlorophenol and at least one mole of the same or another phenol with at least one mole of formaldehyde. The condensation products are subsequently reacted with the salt of a saturated or unsaturated partial ester of phosphoric acid and optionally brominated in the latter case. Flame-retardant polyurethane foams are disclosed containing the novel polyol adjuvants.

9 Claims, No Drawings 1 2 FLAME RETARDANT COMPOSITIONS (2) X X This is a division of application Ser. No. 728,913, filed May 14, 1968 and now US. Pat. No. 3,644,599. i

This invention relates to new flame-retardant polyu- 5 CH CH rethane compositions. More particularly, this invention A relates to novel flame retardant polyurethane foams, to J O novel flame-retardant components incorporated into H2 H2 H2 such foams and to methods of producing such flame-re- EHOH (gHOH (IZHOH tardant foams and components thereof. (3B2 HZ It is an object of this invention to provide novel fireit if H retardant adjuvants for polyurethane foams.

It is another object of this invention to provide new polyurethane compositions having superior flarne-rel5 tardant properties.

It is another object of the present invention to provide methods for the production of polyurethane foam compositions containing novel flame-retardant adjuvants and for the re aration of such ad'uvants themselves, p p J radical PO(OR) and the remaining Ys are selected The foregoing objects and still further objects of the from the 8 p s sting of a hydroxyl radical and the invention are b dl hi according to the radical -PO(OR) in which R is a member of the group present invention by providing novel polyhydric comconsisting of an alkyl radical containing fmm m to pounds useful in the preparation of polyurethane foam foul carbon atoms, alkenyl radical containing from compositions to impart flame-resistance thereto which to four carbon atoms and a haloalkyl radical may be characterized by the following generalized fortaming from two to four carbon atoms and from one to mulas: two halogen atoms having an atomic weight greater wherein n is an integer from 0 to 2, wherein at least one X is a halogen atom having an atomic weight greater than and the remaining X's are selected from the group consisting of a hydrogen atom, a halogen having an atomic weight greater than 30 and an alkyl radical having from one to nine carbon atoms and wherein at least one Y is a hydroxyl radical, at least one Y is the wherein X is a member of the group consisting of a than halogen atom having an atomic weight greater than 30, Broadly in cco dance With this invention the flameand wherein Y is a member of the group consisting of a 40 e ardant polyol adjuvants characterized by formula halogen atom having an atom weight greater than 30 above m y be prepared by the reaction in and the radical -PO(OR) in which R is selected from equimolar proportions of a disodiurn tetrahalo the group consisting of an alkyl radical containing from bisphenol A, 3-halo-1,2-propanediol and 1,3-dihalo-2- one to four carbon atoms, an alkenyl radical containing propanol within a temperature range of about 70 C. to from two to four carbon atoms and a haloalkyl radical about 200 C. and subsequent reaction of the resulting containing from two to four carbon atoms and from product with a suitable alkali metal salt of a partial one to two halogen atoms having an atomic weight ester of phosphorous acid within the same temperature greater than 30, and range. The reaction may be represented as follows:

CH3 I HOCH2CH-CHTX AO- --(i o A X-CHz-CH-CHz-X (BH 4311: (LE

OH: Ho-om-on-cm-o b-Qo-om-on-om-x (5H 21H: (5H X X l APO(OR)2 wherein A is an alkali metal and the remaining generalized symbols are as defined in formula 1) above.

The final product may be halogenated in those instances in which an ester of phosphorous acid containing an olefinic linkage has been used. Halogenation is accomplished at temperatures below about 70 C., preferrably from about C. to about 30 C.

Representative esters of phosphorous acid which may be used are dimethyl phosphite, diethyl and triethyl phosphite, dibutyl phosphite, trivinyl phosphite, triallyl phosphite and others. Tetrabromo bisphenol A and tetrachlorobisphenol A are typically representative of the tetrahalobisphenol A which may be used. The tetraiodo derivative may also be employed, but tetrabromobisphenol A is preferred. 3- chloro-1,2-propanediol and 1,3-dichloro-2-propanol are preferred alcohols for use in preparation of the polyol adjuvants of this invention, but the bromo and iodo derivatives may also be used.

The following are typical examples of the polyol adjuvants subsumed under formula (1) set forth above and useful to impart flame-retardant characteristics to polyurethane foams:

0 o-GHm-cmn: 11/

OCHCHCH=CH1 10 The following are representative examples of the preparation of compounds characterized by formula (l)setforth above:

EXAIVIPLE 1 18.4 grams of sodium are dissolved in 400 grams of butanol in a 1000 ml. 3-neck flask equipped with stirrer, reflux condenser, thermometer, drop funnel and, optionally, with a nitrogen inlet. The sodium is dissolved under reflux (100 C. 120 C.) and then 217.5 grams of tetrabromobisphenol A are added. The resulting mixture is refluxed (100 120 C.) for about 1 hour with good stirring. The di-sodium salt of tetrabromobisphenol A may also be prepared from equivalent amounts of aqueous NaOH. The use of sodium metal eliminates the necessity of removing the water from the reaction kettle. Thereafter, to the resulting di-sodium salt of tetrabromobisphenol A within a period of ten minutes are added dropwise from the dropping funnel 44.2 grams of 3-chloro-l ,2- propanediol. The mixture is refluxed (100 120 C.) for about 1 hour, whereupon the milky white solution tends to become clearer and sodium chloride starts settling out of the solution. Within a period of 10 minutes are then added dropwise from the dropping funnel 5 1.6 grams of 1,3-dich1oro-2-propanol and the mixture is again refluxed (100 C. 120 C.) for about 1 hour with stirring. The reaction upon addition of both 1,3- dichloro-Z-propanol and 3-chloro-1,2-propanediol is exothermic and NaCl precipitates indicating that the etherific condensation is taking place. The resulting ether need not be isolated.

In a second flask the sodium salt of diethylphosphite is prepared by dissolving 9.2 grams of sodium in 200 grams of butanol under reflux (100 C. 120 C.) and then adding 55.2 grams of diethylphosphite and refluxing (100 C. 120 C.) the mixture for about 1 hour. The resulting solution is then added within a period of minutes dropwise from the dropping funnel to the etheric product contained in the first flask. The reaction is exothermic. Refluxing at the same temperature is continued for about 3 hours and the mixture is then cooled to room temperature. The solution is transferred to a separatory funnel and washed with copious amounts of distilled water to remove all NaCl. The top organic layer of liquid contains the desired product which is obtained in 92 percent yield after stripping off the butanol under an aspirator vacuum. The final product conforms in its chemical structure with the formula of example (a) above.

EXAMPLE 2 The intermediate etherific condensation product prepared as described in the first paragraph of Example 1 is isolated and 327 grams of the dry clean product are mixed with 66.4 grams of triethylphosphite. This mixture is slowly heated with stirring to 145 C. 150 C. until ethyl chloride is given off. When elimination of ethyl chloride is complete, the product is cooled and is ready for use as an adjuvant in polyurethane foams. The final product, which conforms in its chemical structure with the formula of example (a) above, may also be prepared by carrying out the reaction between the etheric intermediate and trialkyl phosphite in inert solvents having boiling points greater than 150 C.

EXAMPLE 3 rethane adjuvant desired. The second step in the synthesis of the polyhydric polyurethane adjuvant employs the reaction of the alkali metal derivatives of the methylenically linked polyphenolic intermediate with a suitable quantity of 3-halo-l,2 propanediol to react with at least one and not more than 3 of the phenolic hydroxyl groups of the aforesaid intermediate. The third step of the synthesis involves the reaction of 1,3- dihalo-2-propanol with the remaining phenolic hydroxyl groups of the methylenically linked intermediate. The resulting product is then in turn reacted with an alkali metal salt of a partial ester of phosphorous acid to obtain a final product. The final product obtained, however, may be halogenated in those instances in which an ester of phosphorous acid containing an olefinic linkage has been used. The phosphorous acid esters may be any of those used to form the class of adjuvants subsumed under formula (1) above and v described in connection therewith.

The reaction may be represented as follows:

X X X X A (n+2) (n+1)HCHO CH -CH OH H H n H off. The final product, which conforms in its chemical structure to the formula of example (c) above, is then ready for use as an adjuvant in polyurethane foam.

EXAMPLE 4 The reaction of Example 3 is carried out as described but after the complete elimination of allyl chloride, the solution is cooled with ice-water and from a dropping funnel bromine is added dropwise until bromination of the product is complete (when reddish brown color of bromine no longer disappears even upon heating to 80 C.). After bromination, the naphthalene 1,2,3,4- tetrahydride is removed under vacuum and the final product, which conforms in its chemical structure with the formula of example (d) above, is ready for use in the preparation of flame-retardant polyurethane foam.

In general, the polyhydric adjuvants for polyurethane foam compositions characterized by formula (2) set forth above may be prepared in accordance with this invention by the reaction of halogenated phenols, of halogenated phenols and phenols, of halogenated phenols and alkyl phenols and of halogenated phenols with mixtures of phenols and p-alkyl phenols with formaldehyde in suitable proportion to form methylenically linked phenolic groups of the above stated character providing a compound having at least one chlorinated phenolic moiety. The polynuclear phenolic intermediate compounds formed by the reaction of the phenols and formaldehyde as characterized above may contain as few as two aromatic rings or as many as four, depending upon the character and type of polyu- X X .X

APO(0R)2 CH --CH Hz 41H: lHz HOH JJHOH HOH 3H; H2 H; i l n l X X X @-CH CH O JH (1H2 (3H2 HOH JHOH lHOH H2 H2 E; if ir n it wherein A is an alkali metal, p and q are numbers from (P) z or CH2- CH:

$11. (JHOH HOH HzOH H7 EXAMPLE 5 In a 3-neck, round bottom 1000 ml. flask equipped with stirrer, reflux condenser, nitrogen inlet, water trap and thermometer are dissolved 60 grams of sodium hydroxide in 150 grams of water. To the alkaline solution are added 121.5 grams of a 37 solution of formaldehyde in water, 75 grams of toluol, 300 grams of butanol, 64.28 grams of p-chlorophenol, 75.10 grams of p-t-butyl phenol, and 47.05 grams of phenol. The mixture is heated under reflux and water trap until the stoichiornetric amount of water is obtained (a total of 253.5 ml. of water is collected 150 ml. used to dissolve NaOH, 76.5 ml. from the formaldehyde solution and 27 ml. of water of reaction). Within a period of 10 minutes are added dropwise from a dropping funnel 110.5 grams of 3-chloro-1,2-propanediol and the mixture refluxed for a period of about 1 hour. After the required refluxing there are then added within a period of 10 minutes 64.5 grams of l,3-dichloro-2-propanol and the mixture is again refluxed for about 1 hour to complete the condensation.

In a second flask, sodium diethylphosphite is prepared by reaction of 11.5 grams of sodium in 150 grams of butanol and 69 grams of diethylphosphite. The resulting solution is then added within a period of ten minutes to the first or main reaction vessel and the resulting mixture refluxed for about 3 hours. The reaction mixture is then cooled, sodium chloride removed by filtration or by washing with water and finally solvents are removed, as by stripping them off under vacuum. The resultant final product may be used in the form obtained as an adjuvant in polyurethane foams. The final product conforms in its chemical structure to that of the formula of example (g).

EXAMPLE 6 A methylenically linked intermediate is prepared as described in the first paragraph of Example 5. Subsequently, sodium chloride is removed and the intermediate is obtained dry and clean. 281 grams of the intermediate are then dissolved in 300 grams of naphthalene l,2,3,4-tetrahydride and the stoichiometric amount (55.2 grams) of triethylphosphite is added. The reaction mixture is heated to 150 C. until all ethyl chloride has been obtained. Thereafter, the naphthalene l,2,3,4-tetrahydride is removed under vacuum and the final polyol product, which conforms in its chemical structure with the formula of example (g) above, is available for use in polyurethane foams.

HOH O O-GHBr-CHaBr 0-CHBr-CHzBr An intermediate is prepared as described in the "first paragraph of Example 5. After the intermediate has been freed from sodium chloride and butanol/toluol blend, the stoichiometric amount (80.8 grams) of'triallylphosphite is added to the intermediate together with 300 grams of naphthalene l,2,3,4-tetrahydride and the reaction mixture heated to 150 C. until all allyl chloride is obtained. Finally, the solvent is stripped off under vacuum. The final product conforms in its chemical structure with the formula of example (h) above.

EXAMPLE 8 The reaction of Example 7 is carried out but after the elimination of allyl chloride, the mixture is cooled in an ice-water bath and bromine is added from a dropping funnel until bromination is complete as shown by the fact that the reddish brown color of brominedisappears in solution even when heated to C. Solvent is stripped from the brominated product .under vacuum. The final product conforms in its chemical structure with that of the formula of example (i) above.

In accordance with the present invention the above described polyol adjuvants may be used to prepare any kind of polyurethane foams, i.e., foams or cellular compositions comprising multiple urethane linkages forrned by the reaction of an isocyanate and a compound containing a hydrogen atom or atoms reactive therewith as, for example, hydroxyl-bearing compounds such as polyesters and polyethers having terminal hydroxyl groups.

Suitable polyesters useful in the preparation of polyurethane foams in accordance with this invention may be obtained by esterification condensation reaction of an aliphatic dibasic carboxylic acid with a glycol or triol or mixture thereof in such proportion that the resultant polyesters possess predominately terminal hydroxyl groups. Aliphatic dibasic carboxylic acids which may be used to prepare such polyesters comprise adipic acid fumaric acid, sebacic acid, phthalic acid, and maleic acid, for example, and suitable alcohols include ethylene glycol, diethylene glycol, trimethylol propane and the like.

Fatty acid glycerides may be used as the hydroxylbearing component in the preparation of the polyurethane foams of the present invention and comprise those having a hydroxyl number of at least about 50 such as caster oils, hydrogenated castor oils or blown natural oils.

Polyesters generally which may be used in the practice of the present invention are described and their method of preparation disclosed in U. S. Pat. Nos.

2,453,644; 2,593,787; 2,409,633; 2,443,735; 2,443,741; 2,450,552; 2,255,313; 2,512,410; 2,634,251; 2,662,069 and 2,662,070, all hereby incorporated by reference.

Polyether hydroxyl-bearing compounds which may be used to prepare polyurethane foam compositions in accordance with this invention comprise those having a functionality of two or more, i.e., polyethers which are diols, triols, tetrols, pentols and hexitols. Particularly suitable polyethers are polyoxyalkylene ethers of polyhydric alcohols or amines such as polyoxyalkylene glycols, polyoxyalkylene bisphenol A, polyoxyalkylene sorbitol, polyoxyalkylene methyl glucoside, polyoxyalkylene pentaerithritol, polyoxyalkylene sucrose, polyoxyalkylene trimethylolethane, polyoxyalkylene trimethylolpropane, polyoxyalkylene diethylene triamine, polyoxyalkylene glycerine. The polyoxyalkylene ether of the polyhydric alcohol may be prepared, if desired, by reacting an alkylene oxide compound with a selected polyhydric alcohol in the conventional manner. The overall range of alkylene oxide groups per molecule may vary within a range of about two to about 80 and the alkylene oxides which may be used comprise ethylene oxide, propylene oxide, butylene oxide and others.

More specifically, among the hydroxyl-bearing compounds which may suitably be used to prepare polyurethane foam in accordance with this invention are polyoxyalkylene bisphenol A containing from two to 20 oxyalkylene groups per molecule and including the polyoxyethylene, polyoxypropylene and polyoxybutylene derivatives; 1,2,6-hexanetriol; dipropylene glycol; propylene glycol; ethylene glycol; polyoxyethylene(2)cyclohexane dimethanol; polypropylene glycol (M.W. 1000); glycerine; trimethylol propane; polyoxypropylene(40)sorbitol; polyoxyethylene(20)methyl glucoside; polyoxypropylene(40)isosorbide as well as many other polyhydric alcohols indicated, for example, in U. S. Pat. No. 2,843,568, hereby incorporated by reference. Accordingly, aromatic, aliphatic and cyclo-aliphatic hydroxy compounds may be utilized in the preparation of a polyurethane foam. Ethylene oxide, propylene oxide and butylene oxide derivatives of such polyhydric alcohols may be used, as well as hydroxyl terminated polyesters derived from saturated or unsaturated dicarboxylic acids, simple glycols and modifying trihydric alcohols. In many cases it will be desirable to use two or more polyhydric alcohols in combination to produce a polyurethane foam having the characteristics desired. Glycols having hydroxyl numbers within the range of 1000 to 2000, such as ethylene glycol or diethylene tion are prepared by reacting a hydroxyl-bearing component as described above with an organic isocyanate as described above in suitable proportion to provide a ratio of hydroxyl groups to isocyanate groups within a range of about 1/0.9 to about l/l.7 with a ratio of about 1/1 .05 preferred.

Catalysts which may be used in the preparation of polyurethane foams of the present invention may comprise amine catalysts and tin catalysts or mixtures thereof. Among the suitable amine catalysts are N-alkyl morpholines such as N-methyl morpholine and N-ethyl morpholine; tertiary amines such as trimethyl amine, triethyl amine, tetramethyl quanidine, triethylene diamine, N,N,N,N'-tetramethyl-l,3-butane diamine; piperazine and piperazine derivatives such as N-methyl piperazine. These amines may be present in amounts from about 0.05 percent to about 2 percent by weight of the hydroxy-bearing compounds reacted with the isocyanate compound. Among the suitable tin catalysts are included dialkyl tin laurates, such as dibutyl tin dilaurate, dibutyl tin di-2-ethyl hexoate, dibutyl tin diacetate, stannous oleate and stannous octoate. Tin catalysts may be present in amounts from about 0.1 percent to about 1.0 percent by weight of the hydroxylbearing compounds used in the reaction.

Examples of useful surface active agents which can be present in amounts of from about 0.05 percent to about 2 percent by weight of the hydroxy-bearing compounds used to prepare the polyurethane foams are water-soluble siloxane-oxyalkylene block copolymers as described in U. S. Pat. No. 2,834,748 to Bailey et al., issued May 13, 1958. Other surfactants which may be used are condensates of ethylene oxide with a hydrophobic base formed by condensing propylene oxide with propylene glycol. These surfactants have a molecular weight within the range of about 2000 to about 8000 and are generally ascribed the formula HO(C H O) (C H O),,(C H O) l-I. Another class of surfactants comprises alkylene oxide adducts of ethylene diarnine having generally the formula:

Still another class of surfactants comprise the polyoxyalkylene esters of long chain fatty acids and sorbitan such as polyoxyethylene( 20)sorbitan monolaurate,

polyoxyethylen(4)sorbitan monolaurate, polyoxyethy1ene( 20)sorbitan tristearate, polyoxyethylene( 20)sorbitan monooleate, polyox yethylene(5)sorbitan monooleate and polyoxyethylene( 20)sorbitan trioleate.

Although the polyurethane foams of this invention may use water as a foaming agent, a halogenated saturated aliphatic hydrocarbon or a mixture of such halogenated saturated aliphatic hydrocarbons is preferred, for example, trichlorofluoromethane (Freon 1 1 monochloroethane; monochloromonofluoroethane; l ,2-dibromo, l ,1 ,2 ,2- tetrafluoroethane; l ,1,2-trichloro l ,2 ,2- trifluoroethane, 1,1 ,2,2-tetra.fluoro 1 ,2- dichloroethane; 1,2-difluorol 1 ,2,2-

tetrachloroethane; dichloromethane; dibromomethane and their mixtures. These materials may be present in nearly trace amounts up to about 20% by weight of the hydroxyl-bearing compound, as desired.

In general, polyurethane foams of the present invention may be prepared by reacting a hydroxyl-bearing component which includes a hydroxyl bearing compound of the type hereinbefore described, usually a polyester or a polyether and from about percent to about 50 percent of a polyol flame-retarding adjuvant as described above based upon the total weight of the hydroxyl bearing component. A hydroxyl bearing component containing from about 5 percent to about 50 percent by weight of a flame-retarding polyol adjuvant of this invention will produce a self-extinguishing polyurethane foam (when appropriately reacted with an organic isocyanate) meeting the specifications for selfiextinguishing plastic materials set forth in the Standard Method of Test for Flammability of Rigid Plastics over 0.127 cm (0.050 in.) in Thickness of the American Society for Testing of Materials, ASTM Designation: D-l692 59T Issued 1959. A hydroxyl-bearing component containing from aboutlS percent to about 50 percent by weight of a flame-retarding polyol adjuvant of this invention will, when reacted with an appropriate organic isocyanate, produce a non-burning polyurethane foam composition meeting the specifications set forth in the above-cited ASTM test.

The following are representatives examples of the preparation of flame-retardant polyurethane foams in accordance with this invention:

Component B in the above formulation is prepared by adding each of the named ingredients sequentially in the amounts specified while mixing thoroughly with a high speed mixer. To the component B is then added the specified amount of organic isocyanate (Component A) and and the resulting mixture is stirred at high speed for seconds with a high speed mixer, after which it is then poured into a one-gallon paper cup. Within 8 seconds the foam begins to rise and after 100 seconds the foaming is complete. The fine-celled polyurethane foam produced by this procedure will be found to have the following properties determined, unless otherwise indicated, in accordance with Standard Methods of Tests of the American Society for Testing of Materials cited:

Density (ASTM D1622-63) 1.89 Humid Aging at 70 c. and 100 R.H.*

1 day +11 7 days +13 14 days +18 28 days +20 Heat Distortion Temperature (F.)*

Burning Tests (ASTM D1692-59T) Seconds inches The physical properties of the polyurethane foam indicate that the flame-retarding aromatic polyol adjuvent imparts very good flame-retardancy to the foam, with a high heat distortion point as well as good humid aging properties.

EXAMPLES 10-16 Formulation ComponentA Polymethylene polyphenyl isocyanate 41.8 43.5 43.5 45.5 45.1 45.1

ComponentB Polyoxyethylenefl 0)sorbito1 16.8 20.1 24.0 24.7 28.9 30.6

Ethylene glycol 4.2 4.1 3.2 2.7 1.9 1.5 1.8

Polyol adjuvent of example(a) 20.7 16.1 12.810.6 7.5 6.2 3.8 Organo-silicon surfactant (Union Carbide L53l0) 0.6 0.6 0.6 6 0.6 0.6 0.6 Dimethylethanolamine 0.8 0.8 0.8 0.8 0.8 0.8 0.8 Dibutyl tin dilaurate 0.1 0.1 0.1 0.1 0.1 0.1 0.1

trichlorofluoromethane 15.0 15.0 15.0 15.0 15.0 15.0

Properties CreamTime(Sec.) 15 15 19 20 20 21 19 Foam Time (Sec.) 50 45 44 38 41 45 39 Tack Free Time (Sec.) 64 60 55 45 44 50 48 BurningTest(Sec.) -25 -22 -20 22 34 59 -3O (ASTM-D1692-59T) 26 26 28 -22 -40 45 45 Burning Test (lnch) 56 86 2/4 36 1% 3% S36 (ASTM-D1692-59T) 36 b 36 2563 BC la '6 A A 2% 4 BC V4 V4 36 56 2 4% BC Density 1.96 1.98 2.001.95 2.03 1.89

(ASTM CD-1622-63) Humid Aging (at C. and R.1-1.) lday +16 +16 +11 +15 +9 +12 +19 7days +20 +12 +12 +23 +18 +16 +24 l4days +24 +25 +12 +25 +25 +20 +28 28 days +29 +31 +15 +33 +25 +23 +29 Heat Distortion Temp.

The values given indicate the percentage of volume change. A positive value indicates volume increase; a negative value, shrinkage. "Heat Distortion Temperature is the temperature at which a sample of the foamed material exhibits a 20% defonnation in shape under a load equal to l/10 of the compression strength of the material. Compression strength is determined in accordance with ASTM D-21-64.

Polyurethane foams having the formulation and properties tabulated above may be prepared and evaluated in like manner as the polyurethane foam of Example 9.

The following are representative formulations suitable for the production of fire-retardant polyurethane foams according to the method of the present invention as exemplified in Example 9 above.

EXAMPLE 17 Component A by Weight Polymethylene polyphenyl isocyanate Component 8 Ethylene glycol Polyoxyethylene( lO)sorbito| Polyol adjuvant of example (d) Siloxane-oxyalkylene block copolymer surfactant (1.5310, Union Carbide) Dibutyl tin dilaurate Dimethyl ethanol amine Trichlorofluoromethane EXAMPLE 18 Component A by Weight Polymethylene polyphenyl isocyanate Component B Polyoxyethylene( l0)sorbitol Ethylene glycol Polyol adjuvant of example (g) Organo-silicon surfactant (Union Carbide, L53 l0) Dimethyl ethanol amine Trichlorofluoromethane Dibutyl tin dilaurate EXAMPLE 20 Ethylene glycol Polyol adjuvant of example Organo-silicon surfactant (Union Carbide, L53 l0) Dimethyl ethanol amine Dibutyl tin dilaurate Trichlorofluoromethane The foams are useful wherever flame-retardant foams of the kind are required in the construction industry, the decorative arts and other applications. Having thus described my invention, I claim:

1. A compound of the formula:

| (iJHa wherein X and Y are members of the group consisting of halogen atoms having an atomic weight greater than EXAMPLE 19 Component A by Weight Polymethylene polyphenyl isocyanate 45.5

Component B Polyoxyethylene( l0)sorbitol 24.7

Ethylene glycol 2.7

Polyol adjuvant of example (h) 10.6

Organosilicon surfactant 0.6

(Union Carbide, L53l0) Dimethyl ethanol amine 0.8

Dibutyl tin dilaurate 0.]

Trichlorofluoromethane 15.0

2. A compound of claim 1 wherein X is bromine. 3. A compound of claim 1 wherein X is chlorine. 4. A compound of claim 1 wherein Y is bromine. 5. A compound of claim 1 wherein Y is chlorine. 6. A compound of claim 2 wherein Y is bromine. 7. A compound of claim 2 wherein Y is chlorine. 8. A compound of claim 3 wherein Y is chlorine. 9. A compound of claim 3 wherein Y is bromine.

UNITED STATES PATENT OFFICE \J') CERTIFICATE OF CORRECTION Patent No. 3 I 700 I 739 Dated October 24 1972 Inventor(s) Erich Kuehn ,It is oertified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Formula bridging Columns 5 and 6 should read A, (n+2) (n+l)HCHO A CH CH 2 2 I OH OH OH OH pHO-CH CH-CH X+qXCH CHCH -X CH CH l I OH OH A 0A 0A Column 13, line 51, one of the "and" '5 should be deleted.

(Continued on Page 2) UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent 3,700 ,739 v Dated October 24, 1972 Invencofls) Erich Kuehn 2 It is certified that error appears in the aboife-identified patent I and that said Letters Patent are hereby corrected as shown below:

Page 2 Column 14, lines 12 through 51 (the table entitled "Examples -16") should read as follows:

EXAMPLES 10-16 Formulation Component A Polymethylene polyphenyl isocyanate 41.8 43.5 43.5 45.5 45.1 45.1 46.4

Component B Polyoxyethylene(10) sorbitol 16 8 20.1 24.0 v 24.7 28.9 30 .6 31.5

Ethylene glycol 4.2 4.1 3.2 2.7 1.9 1.5 1.8 Polyol adjuvent of example (a) 20.7 16.1 12.8 10.6 7.5 6.2 3.8

Organo-silicon surfactant(Union Carbide L5310) 0 .6 0.6 0 .6 0.6 O 6 0.6 v 0. 6 Dimethylethanolamine 0.8 0.8 0.8 0.8 0.8 I 0.8 0.8 Dibutyl tin dilaurate 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Trichlorofluoromethane 15.0 .0 15.0 15.0 15.0 15.0 15.0

1 Properties Cream Time (Sec.) 15 15 19 2O 20 21 19 Foam Time (Sec.) 50 44 38 41 45 39 LTack Free Time (Sec.) 64 60 55 45 44- ,J 48

(Continued on Page 3) 37 3 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent NO. 3,700,739 Dated October 24, 1972 Inventor s) Erich Kuehn It is certified that error appears in the above-identified patent and that said Letters Patent are hereby Corrected as shown below:

Page 3 Burning Test (Sec.) 22 -20 22 34 59. (ASTMDl69259T) 26 26 ,28 -22 45 30 30 26 23 39 --38 28 -32 19 .29 21 30 -47 40 Burning Test (Inch) 5/8 1/4 2/4 3/4 1 7/8 3 1/2 5 3/4 (ASTM-D1692-59T) 3/4 1/2 7/8 3/4 2 l/2. 3 1/2 BC 1/4 5/8 1/2 1/2 2 1/2 4 BC 1/4 1/4 I 3/4 3/4 2 4 1/2 BC Density 1.96 1.98 2.00 1.95 2.03 '1. 89 1.94

(ASTM CD162263) Humid Aging* (at C. and R.H.) v

1 day +16 +16 +11 +15 +9 +12 +19 7 days +20 +12 +12 +23 +18 +16 +24 14 days +24 +25 +12 +25 +25 I +20 +28 28 days +29 +31 +15 1 +33 +25 +23 +29 Heat Distortion Temp.

Column 15, line 3, the words "Component B" should be'underlined so as to indicate a heading.

Column 15, line 17, the words "Component B" should be underlined so as to indicate a heading.

(Continued on Page 4) J UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent 3,700,739 Dated October 24, 1972 Inventcr(s) Erich Kuehn It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Page 4 Column 15, line 35, the words "Component B" should be underlined so as to indicate a heading.

Column 16, line 7, the words "Component'B" should be underlined so as to indicate a heading.

v I Signed and sealed this 8th day of May 1973.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. I ROBERT GOTTSCHALK Attesting Officer v Commissioner of Patents 

2. A compound of claim 1 wherein X is bromine.
 3. A compound of claim 1 wherein X is chlorine.
 4. A compound of claim 1 wherein Y is bromine.
 5. A compound of claim 1 wherein Y is chlorine.
 6. A compound of claim 2 wherein Y is bromine.
 7. A compound of claim 2 wherein Y is chlorine.
 8. A compound of claim 3 wherein Y is chlorine.
 9. A compound of claim 3 wherein Y is bromine. 